Apparently removal of the Supanet software is not at all easy. I quote from another thread
"According to PCPro, all Tiny PCs come with a software modem preloaded with the Supanet ISP and this has to be removed (Supanet, not the modem) before you can use your own ISP . The removal or "Deoptimisation" procedure shown in the June 2004 issue looks a bind to say the least."
I assume this to be the problem.